/*
 * Copyright 1999-2011 Alibaba Group.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.dubbo.rpc.proxy.javassist;

import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.bytecode.Proxy;
import com.alibaba.dubbo.common.bytecode.Wrapper;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.proxy.AbstractProxyFactory;
import com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker;
import com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler;

/**
 * JavaassistRpcProxyFactory
 *
 * @author william.liangf
 */
public class JavassistProxyFactory extends AbstractProxyFactory {

    @Override
    @SuppressWarnings("unchecked")
    public <T> T getProxy(Invoker<T> invoker, Class<?>[] interfaces) {
        return (T) Proxy.getProxy(interfaces).newInstance(new InvokerInvocationHandler(invoker));
    }

    @Override
    public <T> Invoker<T> getInvoker(T proxy, Class<T> type, URL url) {

        // 为目标类创建 Wrapper
        final Wrapper wrapper = Wrapper.getWrapper(proxy.getClass().getName().indexOf('$') < 0 ? proxy.getClass() : type);

        // 创建匿名 Invoker 类对象，并实现 doInvoke 方法。
        return new AbstractProxyInvoker<T>(proxy, type, url) {
            @Override
            protected Object doInvoke(T proxy1, String methodName, Class<?>[] parameterTypes, Object[] arguments) throws Throwable {
                // 使用wrapper.invokeMethod方法调用实现类时，并没有使用反射调用。可以保证provider方法调用时的效率。很牛批。wrapper.invokeMethod()方法实现如下：
                return wrapper.invokeMethod(proxy1, methodName, parameterTypes, arguments);
            }
        };
    }
}

//  public Object invokeMethod(Object var1, String var2, Class[] var3, Object[] var4) throws InvocationTargetException {
//      DemoService var5;
//      try {
//         var5 = (DemoService)var1;
//      } catch (Throwable var8) {
//         throw new IllegalArgumentException(var8);
//      }
//
//      try {
//         if ("sayHello".equals(var2) && var3.length == 1) {
//             return var5.sayHello((String)var4[0]);
//         }
//      } catch (Throwable var9) {
//         throw new InvocationTargetException(var9);
//      }
//
//      throw new NoSuchMethodException("Not found method \"" + var2 + "\" in class com.alibaba.dubbo.demo.DemoService.");
//  }